Regulation of the Ca2+ sensitivity of the nonselective cation channel TRPM4

TRPM4, a CA(2+)-activated cation channel of the transient receptor potential superfamily, undergoes a fast desensitization to CA(2+). The mechanisms underlying the alterations in CA(2+) sensitivity are unknown. Here we show that cytoplasmic ATP reversed CA(2+) sensitivity after desensitization, whereas mutations to putative ATP binding sites resulted in faster and more complete desensitization. Phorbol ester-induced activation of protein kinase C (PKC) increased the CA(2+) sensitivity of wild-type TRPM4 but not of two mutants mutated at putative PKC phosphorylation sites. Overexpression of a Calmodulin mutant unable to bind CA(2+) dramatically reduced TRPM4 activation. We identified five CA(2+)-calmodulin binding sites in TRPM4 and showed that deletion of any of the three C-terminal sites strongly impaired current activation by reducing CA(2+) sensitivity and shifting the voltage dependence of activation to very positive potentials. Thus, the CA(2+) sensitivity of TRPM4 is regulated by ATP, PKC-dependent phosphorylation, and Calmodulin binding at the C terminus.